DxCodebookFY2027 · Oct 1, 2026 – Sep 30, 2027

Category · FY2027

R71 Abnormality of red blood cells

  • Header · not billable

R71 is not billable. The category heads 2 billable codes in FY2027: the 2 codes directly below it.

Index → code

  • Anisocytosis → R71.8
  • Poikilocytosis → R71.8
  • Drop (in)hemoglobin → R71.0

Where it sits

  1. Chapter 18 Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R99)
  2. R70-R79 Abnormal findings on examination of blood, without diagnosis (R70-R79)
  3. R71 Abnormality of red blood cells
Billable codes
2
Subdivisions
2
CC / MCC codes
1 / 0
HCC V28 codes
0
New FY2027
0
Index entries
11

Codes in R71

  1. R71.0
    Precipitous drop in hematocrit
    BillableCC
    Inclusion terms 2

    Inclusion terms

    • Drop (precipitous) in hemoglobin
    • Drop in hematocrit
  2. R71.8
    Other abnormality of red blood cells
    Billable
    Inclusion terms 4

    Inclusion terms

    • Abnormal red-cell morphology NOS
    • Abnormal red-cell volume NOS
    • Anisocytosis
    • Poikilocytosis

CC/MCC: as a secondary diagnosis, unless the principal diagnosis is on the code’s PDX exclusion list (MS-DRG v44 Appendix C; list on the code card).

Sources of each column.

Instructions

At R71

Excludes1

  • anemias (D50-D64) D50 D64
  • anemia of premature infant (P61.2) P61.2
  • benign (familial) polycythemia (D75.0) D75.0
  • congenital anemias (P61.2-P61.4) P61.2 P61.4
  • newborn anemia due to isoimmunization (P55.-) P55
  • polycythemia neonatorum (P61.1) P61.1
  • polycythemia NOS (D75.1) D75.1
  • polycythemia vera (D45) D45
  • secondary polycythemia (D75.1) D75.1

Notes that also apply

Block R70-R79 instructions (Excludes2 7): printed on the block page.

Chapter 18 instructions (Notes 9, Excludes2 4): printed on the chapter 18 page.

Index entries

  • Anisocytosis → R71.8
  • Poikilocytosis → R71.8
  • Decrease (d)hematocrit → R71.0
  • Decrease (d)hemoglobin → R71.0
  • Drop (in)hematocrit (precipitous) → R71.0
  • Drop (in)hemoglobin → R71.0
  • Findings, abnormal, inconclusive, without diagnosishematocrit drop (precipitous) → R71.0
  • Abnormal, abnormality, abnormalitiesred blood cell(s) (morphology) (volume) → R71.8
  • Findings, abnormal, inconclusive, without diagnosisanisocytosis → R71.8
  • Findings, abnormal, inconclusive, without diagnosispoikilocytosis → R71.8
  • Findings, abnormal, inconclusive, without diagnosisred blood cell (count) (morphology) (sickling) (volume) → R71.8

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